IBM 4332-004 - InfoPrint 40 B/W Laser Printer User Manual page 196

7. Locate the two connecting brackets and screws that came with the
2500-Sheet Input Unit. Note that each bracket is unique.
8. Attach the right bracket to the printer with a screw, as shown.
9. Attach the left bracket to the printer in the same way.
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Infoprint 32 and Infoprint 40: User's Guide